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Long-Term Debt and Other Borrowed Funds (Details) - USD ($)
$ in Millions
Dec. 31, 2020
May 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument        
Stated interest rate   5.25%    
Long-term debt $ 98.6   $ 0.0  
Long-term debt and capital lease obligations 112.4   13.9  
Fiscal Year Maturities of Long-term Debt        
2018 0.1      
2019 5.2      
2020 0.1      
2021 0.1      
2022 0.1      
Thereafter 106.8      
Long-term debt and capital lease obligations 112.4   $ 13.9  
Advances from FHLB 0.0      
Other borrowings 0.0      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 1.4      
FIB        
Fiscal Year Maturities of Long-term Debt        
Ownership percentage in subsidiary 99.90%      
Parent        
Debt Instrument        
Long-term debt $ 98.6      
Capital lease obligations | Capital Lease Obligation, 8.00% | Subsidiaries        
Debt Instrument        
Stated interest rate     8.00%  
Capital Lease Obligations 1.1   $ 1.2  
Notes payable | Subsidiaries        
Fiscal Year Maturities of Long-term Debt        
Long Term Debt, Acquired or Assumed 12.6      
Notes payable | Note Payable, 6.24% | Subsidiaries        
Debt Instrument        
Stated interest rate     6.24%  
Notes payable | Note Payable, 1.30%, maturing March 31, 2038 [Member] | Subsidiaries        
Debt Instrument        
Long-term debt 2.0   $ 2.0  
Notes payable | Note Payable, 1.30%, Maturing June 1, 2034 [Member] | Subsidiaries        
Debt Instrument        
Long-term debt $ 0.6   0.6  
Notes payable | Note Payable, Two Point Two Eight Percent | Subsidiaries        
Debt Instrument        
Stated interest rate 2.28%      
Notes payable | Note Payable, One Percent | Subsidiaries        
Debt Instrument        
Stated interest rate 1.00%      
Notes payable | Note Payable, 2.28% | Subsidiaries        
Debt Instrument        
Long-term debt $ 5.0   5.0  
Notes payable | Note Payable, 1.00% | Subsidiaries        
Debt Instrument        
Long-term debt 5.1   $ 5.1  
Federal Home Loan Bank | Notes Payable to FHLB | Subsidiaries        
Fiscal Year Maturities of Long-term Debt        
FHLB, advances, maximum amount available 1,697.5      
Secured Debt        
Fiscal Year Maturities of Long-term Debt        
Line of credit facility, maximum borrowing capacity 478.6      
Federal Funds Purchased        
Fiscal Year Maturities of Long-term Debt        
Line of credit facility, maximum borrowing capacity 205.0      
Unsecured Debt [Member]        
Fiscal Year Maturities of Long-term Debt        
Line of credit facility, maximum borrowing capacity $ 50.0      
Subordinated term loan | Subordinated Notes Due May 2030        
Fiscal Year Maturities of Long-term Debt        
Debt Instrument, Face Amount   $ 100.0    
Subordinated term loan | Subordinated Term Loan, 6.81% | Parent Company        
Debt Instrument        
Stated interest rate       6.81%
Minimum | Note Payable, 6.24% | Subsidiaries        
Debt Instrument        
Stated interest rate 1.00%      
Maximum [Member] | Note Payable, 6.24% | Subsidiaries        
Debt Instrument        
Stated interest rate 3.25%